Tiny polymer pores could cut oil refining energy use

A June 9 review in Chinese Journal of Polymer Science says microporous polymer membranes could help replace energy-hungry thermal distillation in crude oil refining. The research maps a path to faster, more selective hydrocarbon separation, but says durability and scale-up remain the main hurdles.

Why it matters: - Crude oil refining still depends heavily on thermal distillation, which uses repeated heating and phase changes to separate hydrocarbons. - Microporous polymer membranes could move some of that separation work to lower-energy processes. - If the technology scales, it could reduce energy use, cut carbon emissions and make crude oil fractionation more flexible.

What happened: - A review published online April 9, 2026, in Chinese Journal of Polymer Science examined microporous polymer membranes for hydrocarbon mixture separation. - The review was written by Jun-Kai Fang, Kang Peng, Xin-Chi Ma, Zheng-Jin Yang and Tong-Wen Xu from the University of Science and Technology of China. - The article covers synthetic strategies, pore structures, anti-swelling behavior, organic solvent reverse osmosis performance and crude oil fractionation demonstrations.

The details: - Microporous polymer membranes can separate hydrocarbons through nanoscale pores instead of boiling-point differences. - The review groups these membranes into dibenzodioxane-based polymers, microporous polyamines, polytriazoles, polyamides, polyimines, polyimides and polyureas. - Rigid, twisted or nonplanar polymer chains create intrinsic micropores because the chains cannot pack tightly. - Those internal pores can let smaller hydrocarbon molecules pass while holding back larger fractions. - The central challenge is the permeance-selectivity trade-off: more open pores can raise flow but weaken separation, while tighter pores can improve selectivity but slow transport. - Researchers are trying to improve performance with rigid spirobifluorene or triptycene units, fluorine-rich side chains, crosslinked networks and molecular gating effects. - Reported examples include fluorine-rich poly(arylene amine) membranes that enriched light hydrocarbons from 74 wt% to 95%. - The review also cites polyimide membranes that increased gasoline content from 54.5% to 96.8%. - Fluorinated polyamide membranes showed stable separation performance. - Organic solvent reverse osmosis can operate under milder conditions than thermal distillation by using differences in molecular size and chemical affinity. - Crude oil remains difficult to separate because it contains hydrocarbons with overlapping sizes, shapes and interactions.

Between the lines: - The field is shifting from basic membrane chemistry toward application-oriented design. - The authors argue future membranes need pores that stay stable in harsh hydrocarbon environments, not just more pores. - Backbone rigidity, side-chain chemistry, solvent swelling and pore connectivity all need to be engineered together. - That approach could help membranes combine fast molecular transport, sharp selectivity and longer durability under industrial conditions.

What’s next: - Practical deployment will depend on cost-efficient large-scale fabrication. - Long-term stability in harsh crude oil environments remains a key requirement. - Researchers still need to keep improving the permeance-selectivity balance. - The review also points to potential uses in organic solvent separation, fuel upgrading and recovery of high-value hydrocarbon fractions.

The bottom line: - Microporous polymer membranes are not ready to replace distillation, but the review argues they could become a lower-energy alternative if researchers can solve the speed-versus-selectivity problem and make the materials durable at scale. - More information: Original Source